The demand for cryogenic memory components is driven by the need for ultrafast, low-power, and highly reliable computing systems. Phase-slip-based devices promise to fulfill all these requirements, with potential applications in both classical and quantum information processing. However, previous implementations have faced challenges due to inefficient writing and readout schemes. In this work, we address these limitations with a simple device design and measurement techniques inspired by circuit quantum electrodynamics. We present a memory element that stores information in the winding of a high-kinetic inductance superconducting loop, inductively coupled to a coplanar waveguide resonator. Using 2-$\text{μ}\mathrm{s}$ single-shot measurements, we bring the resonator to the steady state and achieve a readout fidelity of 99.698% with an active measurement time of just 25 ns.

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• Circuit quantum electrodynamics
• Phase slips
• Quantum information processing
• Devices for digital logic, storage & processing
• Nanostructures
• Superconducting devices
• Weak links
• Microwave techniques